The highlighted structure contains part of the brain system that maintains cortical alertness. What is the name given to this brain system

Reticular formation

Explanation:

The Reticular formation consists of nuclei which are connected together. They are found in the Brain Stem. The Brain stem and Reticular formation are also both found in the Medulla Oblongata.

They however contain rich volume of cells which helps in the cortical alertness and they also help in the control of the activities of the skeletal and some parts of the muscular system.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.